/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * libc/syslog/lib_syslogstream.c
 *
 *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <tinyara/config.h>

#include <stdio.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>

#include <tinyara/syslog/syslog.h>
#include <tinyara/streams.h>

#include "syslog/syslog.h"

#ifdef CONFIG_SYSLOG

/****************************************************************************
 * Pre-processor definition
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: syslogstream_putc
 ****************************************************************************/

static void syslogstream_putc(FAR struct lib_outstream_s *this, int ch)
{
	int ret;

	/* Try writing until the write was successful or until an irrecoverable
	 * error occurs.
	 */

	do {
		/* Write the character to the supported logging device.  On failure,
		 * syslog_putc returns EOF with the errno value set;
		 */

		ret = syslog_putc(ch);
		if (ret != EOF) {
			this->nput++;
			return;
		}

		/* The special errno value -EINTR means that syslog_putc() was
		 * awakened by a signal.  This is not a real error and must be
		 * ignored in this context.
		 */
	} while (errno == -EINTR);
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: lib_syslogstream
 *
 * Description:
 *   Initializes a stream for use with the configured syslog interface.
 *
 * Input parameters:
 *   lowoutstream - User allocated, uninitialized instance of struct
 *                  lib_lowoutstream_s to be initialized.
 *
 * Returned Value:
 *   None (User allocated instance initialized).
 *
 ****************************************************************************/

void lib_syslogstream(FAR struct lib_outstream_s *stream)
{
	stream->put = syslogstream_putc;
#ifdef CONFIG_STDIO_LINEBUFFER
	stream->flush = lib_noflush;
#endif
	stream->nput = 0;
}

#endif							/* CONFIG_SYSLOG */
